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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e2b411c1e72deda14c263c2f5759b52a4ea8cca8fd3b6f4aa378e792abde7a3' 
  AND token = 'k/XI4OdzoPtD7GA+rq8xM3bqYcfCP9+L1OFUSAqjC6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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