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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8bbeafb7c30f23c07e6e5cf2ecaabe536f3afa0f8b87e2bfbdd8348d57dc372' 
  AND token = 'cR2X17Ugn/YoDuX7ghQQFuT7+0vTH8jS4DnFCmDkmc0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}