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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c26ff9dde9ceedc9297897c7da88a81a62ad2f3b17385dbbadf08305c6fbb112' 
  AND token = 'XwVzHv2NGUKdNuI9vP55wDRUzCwl3pBr0dCpl/eZDw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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