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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0327806f49708e9c5cd67f7d0a6827d88900430880666811d7ea0e388fe31066' 
  AND token = 'meMLWfkvc+sefvhsFq9EcKvpVJ9cWHg/EL1oa1VwQeQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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