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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbe2d957cb50149a01f5cd2a9f9b0108ca7e810bf0cb751169f6867ce6261098' 
  AND token = 'N6WW/Hdy1jkX6zAqirbVWQTrVo2UPdZSSpcem5Dm9Js=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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