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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e7580c828d24e968bd7c345a78b6f7ab9b703ba90bd8855760a343d058aa1ff' 
  AND token = '73EHKmZlY/9vwxiK+gnFX6UYhDE5r+bK3ENOsb0l8n8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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