SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9315b1d662373cda49b17cdba29af2c825d7d39da1515e5351bc41f714184646' 
  AND token = '97FmFtO1Pq+Z0HS00ZLeYi4VvH3j7MsvUBzR1Epw/sg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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