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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5918ebd45fdd48eba0d202946ba17375c8f68ee6dd6cdcf7aae6b9235d057a68' 
  AND token = 'qBD6o61VPa06xmS3GpaukL+y++cymYQSqTjpTDCx44U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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