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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1dcc912336d75f635a3f88bff9dae62d0055df318bc3a57310b9a9ec8a7ef872' 
  AND token = '0Wn5I5ji7kxt3rIP7AHZLolimRmyrTkil21Pl+vAEnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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