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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd393c860001b330f9ea6db7727ef7f26c616237de0a5d402147bad99ad27664a' 
  AND token = 'tBEdqC2LzecDu6nzLN35TT8O7ezLaIS+7jkt5wv97yM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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