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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '859c3eef11deac10e12585291de6ac5e7c716abe08a53df2d8b236edf924de8e' 
  AND token = 'Z+D86nRcJIXrkPUrRcxXm8/cv4VNRN3UXeZqkr4YoOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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