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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eaeaf6393ffb1b01d228e784005132b62f063d1be044200839bc3bdae179a3cc' 
  AND token = 'SavbZA51nr8Ujge28Jpr5uQpeiUb6kYHegl5Y7/9Mik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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