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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13cb9a48ff40c002dfe4ecf9efd117eb8d636c1ee7b8a3257a29c50975d135fd' 
  AND token = 'NmPDi8mTh7xJx2jrSDqqc4cQpM1j30K78ThbVR89OTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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