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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efc1a6e835e413c1f4ea450b0bb9d8d9aa1ac55506d0d9b9f44094d7b9b01c79' 
  AND token = 'G6sdTeE3aKoPS3hVFI9eT+uSetTjUQvW08hdkGaoGps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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