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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c57e11f375e7801bd3b6a7b2f0f247a47c52631fcb91cd504b0ad6ab98d9e684' 
  AND token = 'MgANxl06/orXc8Rzj5U87NazNp2vjvRqC0bHDAgHxAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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