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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '761f33549eee5289bb93a7c153c9d452e58f16896a423f0f378058d1658ab923' 
  AND token = 'aU1iJaJRehxlRIr0JboFiSZzCyJDVETqIbDQXE89h6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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