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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3997c93e2efce30bcd919356d30b50caf6f640de491dc2027dcb628208f116d' 
  AND token = '6G6sO/JvS+PswZAlcN6KYES5Pf501xUvX2vMDRlYeFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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