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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'feb56e448593d7efc057ea6ba131a5bc9cb8a90058b6e103e308fd0712a48484' 
  AND token = 'luDNWmLMbV8Z2w6udScdoe/co+kh0CwaQjv1ZI4Cf10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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