SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3c5b4a1ea35f25f4f9bfdb09c25784c0c55485f8fda23d8dc3ab07e8812f16b' 
  AND token = 'zWQDNx/7GeZX23nqcylvqP1Xk2OIGDLws7BtiKUhzIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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