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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '740a89f39490e5b0b772bfc7546b89c13fea2d6709b5f7946f293a92ee8aa549' 
  AND token = 'xjGuGJkI+n9oP8RhAIg80VZkiCd9Fbgani0rDluPMyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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