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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a03a4249fab4ff3095753f0b1e8a5199e8c914963eeed82fbb896d9eab5648a' 
  AND token = 'xdZSYOV3lQgQNhLW4PREo+IQl9l46K6jfDhS5tPG9dQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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