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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1795502c19fa8252f5542a2d38c9b4f24f7a1504d3146d84e962f6111f4304a2' 
  AND token = 'hX3vAm79qfTGBSbqktbGM6Y6v4DEsnbjsAYlyFxY9AM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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