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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8947c1699e361a89100151ac5b650cc550edc0150f5928582705f12a104e7256' 
  AND token = 'TBHLJKgM2U6KPIoL4O5nqq5eH4oi+jrrXn3fF/y8HuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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