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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e11335584a5e83c27224ee634b4562f2d5958605615408176f0ef9aea8475724' 
  AND token = 'ypGP2tYj/awQXyPN0CcllBc0UcOA/veQ5nrAx7ma+0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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