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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5da6d032c112d0d01a48e79eadda19f0b21d1631e35e13687ae3d71278fedf0d' 
  AND token = 'DDdSwzzYo666Nt4FHw57UaV01UK4/lnjp/JWslZ8GAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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