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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa0a0e56dda3135b80497771f68c363c7e52e7cfdc6f86459bf5bf8def82f273' 
  AND token = '6hwFgfOd02NFMw4nnu9JlscFW6JX4HGlrl+DJ70uVx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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