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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '047f8a57da370bdf73622b3aec56b47a5eec433f57f7bfa5ffc20f7f969319c6' 
  AND token = '2pxcgVRKVPPGKsDU21NKIGwlakvehblpPo2A64a2+X0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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