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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dc9c2445dcae83446d9251d7d39d29d77576805cda85c8fbcb86c3d64bf9a30' 
  AND token = 'KIkNOeACJ0pdAj3soP5xMwqTRo6Bzr34xjMQJ3dakpo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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