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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0738c52b20f137febf1d797e20eb891ec669cd15c8e9c1909b889e76188f7b82' 
  AND token = '0K2B/VkqkpRpnfwg83myiFUwxZ06fILaEOFXZ+eH4iU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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