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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd83b46d0ba688b7c97a406476e25535582bbea197bdf4e70571ab8c3d953a562' 
  AND token = 'Zic7LD8rmdlvD24u7lMzszWyJrgzJ+7Pbxc2uoXZN/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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