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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a76d1f7ba359ed14a79b70b24b60a15822dba8b3cacecb01733f011b988559fd' 
  AND token = 'audEogZ0mp9kbFLA/GGDQJKTfcC3/ikvxhRXobrAeGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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