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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1052c2ae50fda6f661a6509340b507ae74e4d11b6fd22e96b39d4c364ce8f9c' 
  AND token = '6Qafv9E7fmRKj14JMZBA8d3/RqUmvIrAxijqJ4ANU0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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