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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71a71db820c9628c4b1ee83a588a05a89856578a49dda701867c20c7bd118669' 
  AND token = 'ML+fpsFjreCK6Dh5AdA3b7e3hFX3IXwv3FFzh/KcbNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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