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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bee64ab50013987b9464a9b11aa6424d49f09686539c6a590fe85018d5c9a14' 
  AND token = 'zMlflFQZp19ZRwpC5NhfHPgqN47LefoBgKsiPBIQGPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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