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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71b5ef2a93fd3935bd5d8a175eb16b932652646a30c5ce95ff2458a8766e12f8' 
  AND token = 'siFRscG+2ISPD70XYWxnHQ0d71OaX3JHRHRFo5gpF+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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