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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56b689fae438cd8ad9a634b225a0b15ddc412fd630f4dd8ccb38c8cf479e9323' 
  AND token = 'tbYihu9Y6PS0NU0c0JzU8j7EAsauh823VfT2dlZh9N8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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