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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fde1acfc0e682a9b683208cfb7ffe4ce4657a815b5aa2f90f5fb2ed2127b1d93' 
  AND token = 'evRqVWB8L3jtD2aXIhpTXQP5pLgT/9zyk0QJknmJrXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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