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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50ce5ce986e443406e8249a0e3ebc0793b270639d58a107bfeb8961149adba04' 
  AND token = 'zGM/KUhGwaclnA8de/ydaD77PpA5Ar2VROh9hsBO2ew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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