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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bacd4f96905b0dded127ce36b45e0e911ae8a41c890977667c6ce727ffcc59f' 
  AND token = 'Z1psD3xgwuV17NDEJVuW2hO3fYIFrTLRS8UFcH2v3ZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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