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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23c9a1c31564b7e702178685ccbc9b47cf20603c4433552090fe57c1aff0a42b' 
  AND token = 'GGzX1hQUcE0mt2sXsoMMD7ktxJNnqQCR9eE5+HTexXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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