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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1864fa6e98761a644b10591ed909098d6a47de5c93613b28373354444ed56d66' 
  AND token = 'uf3Vp8Oj6lcRG2jiBblTaSuBII3l2Ao8JhqXH6YVZHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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