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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe51b8b9f61a9baabd888b2fec5c8d1263892a19b46fb3fcc3e46919a47926af' 
  AND token = 'k9I+w9PoelIJO5by7IxmuzLQ4EgH7GCFrwBHB5Afioo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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