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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0daea832e311614ec65499d62c2f8bbe07c1bbdfbc94748b4eba63d810aad583' 
  AND token = 'Q7daHaNK7T97Y2pNeqqdUYRFieHMPDO0duGkMt64jI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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