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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5c787c7c718aadb4d4d3826fdbb2e98534c83fb4be3d1395dff8229224a70c6' 
  AND token = 'LObCAIH/uRrAfPZxQK1yD366p0MclLVovy9zoEtDD9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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