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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9817b9be2e2d50718c82d96e9943dc239277b763dae0f7d9f783f90b12099f2' 
  AND token = 'C22GOpP68i8bhpoMSItdRD7/OxYYgubB+R/BGQ+ARqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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