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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '764373ffbdb8494300b9259d44be6a180681009ec8d3caae482ee3c4b4dbc166' 
  AND token = 'ZSv3L6HmFNtsBkhp5svrZatf5WMucMzF42FaNE+Nq2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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