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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95ea8a90dc9eeb1eb011c8a5f7a853fb78d533fc7e2e7ee03cdf134713ca6a19' 
  AND token = 'F7COHWzvN1T9JnxfnKfKnZpwr3pTYAt2Svsfw10QzPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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