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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8788298c9661fb3a21ddee406d86368be5819b36ead9e547270217dd0d73cb50' 
  AND token = 'Gz1tSQ3iWlP5IZepAFsyJi3Vsw/ZnmKSlJN5Qdme4GU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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