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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cce4d2b156c3bec715281d7912ae3ad2a2909b0307ae80f403b08b2b49401432' 
  AND token = 'eeTP/RuJMiZbpat4oSWIPP7Rbj8yMjg/FtbqmQd+IL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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