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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25292ae878eb029ac324558378d943fb15e1b4f2048f29d5cac16aa3867645a6' 
  AND token = 'CTjhTcrbp1tx+KEowqmAwneiJgceJ2UegtFDg5KLjtg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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