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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab4ff08065919c48264126601bbcd374aa6022c0340f8fa343bb6a8827102d11' 
  AND token = 'suNl6v0L9zq6JcUj/Eio9tqu9NKfjPjwzAxZEYJrsss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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