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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '773e3d5a9b005297a777d7c85337379ff5e4a2a637b3f01a5f2b174044af1fb3' 
  AND token = 'tW+2L1fd00HvQx4YRrPUcd3HInCCfbHLpvXLmURovu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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