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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dbe271ab75515dabeab91c71cf377efb92c401080715090b300ff5e320e7f55' 
  AND token = '5MJwhwlufvxwQHd6cdyNxOpv+J80mLnjoXLoAaRny0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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