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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e48d5fc70988b8536e8f330ec1b6f3a83a68c9bc70eec8aabdefb33cb49485e' 
  AND token = 'q8gtrBXDA8qylv2tCxltZN7D/CGASu8JJvOFdaiarfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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