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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '157d9ecc5b13188b898a041241a7b20ac0705632778efa1c1025bb965276ac3b' 
  AND token = 'Al7K+0952bgZeUl2iFA/3XJWuCuVnb/EY3KDB4/4YOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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