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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38f38e46573c3f2490aee1474e89989f31e1861f652b4508196a61dc0a89010c' 
  AND token = 'BFMZOZMCJlBxD90JWEWImD6MpG5UYnLob6McXWAHIQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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