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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f4118f9b3b844a65f3910ecbb7f8967c099bc760034367eac2ae00c9b6294a4' 
  AND token = 'bJJhcQFJckMCkqHEp0xrJalBT6FO6P3KEKIpOmoGhfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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