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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4632938c123c00b7e47ac11f5997bc413d4ea4faa5e9d03dd61ef0ca48630b1b' 
  AND token = '+CV6Ee2i3AjK3IOuCo33/b3PUHFd0n15FV2L43Mk3mI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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