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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05fe28a409d5d07f420c418a81452e42a27683a1e0b91d43c1633e16b4d54304' 
  AND token = 'cdaLQDEk0ud4gx3+V4ziTjxkBgqH70b8xkmECYTkd70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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