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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f92a7c0e336d82884620f8ea58f14f6e80888ca05351b793eec38f3389866945' 
  AND token = 'sL2TGXCnNHYMKYA8y28+SRiF1ERF/YujQLqpObY39HM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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