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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa66c9c62aa00216626ecdd816c7995430b8561a6d453c71ace98c94b58059d6' 
  AND token = '4bwGS2Ju9Smz+LyEyjhFm7Me+tAayCHGjClq2JYYhzY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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