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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2634849d003a0df0d239970591174439a2a7207d9a31e90491226b3b74601c54' 
  AND token = '5ZcPPCY8I/Ls8CGsBDEDzk6EJzeF2nO4HDVftWdeD6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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