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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30f9fcbd78f6d5da54c82654a19fc365f37923010d65d1ef843aac89b3f5aa13' 
  AND token = 't12ygxESg6b9IVdql3LCEmgEeEG6jeBUwdkjrSsZR34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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