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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eebc9fb4917a1adf5cb880bf18bd807172f7b8593fb7a581d692cb596ee4ba02' 
  AND token = 'vaFm/6MOdgXt0bE9qOXQdPwpN1g2+T6vyaGaasboYfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00097

JSON explain

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