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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b61887f7005000d804dfdfb7bfb337f5f338f821fc9e3eb743d9b3a088d6d77a' 
  AND token = 'GP7pbuLmAFDZFar2OCvUf6LwcKuoUvpBOSoxDMvP7T4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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