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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61400a2ac17e5a22c30e9544dba19616a92c382d700ca8e41daf561f1e1e7df4' 
  AND token = 'UTwWE2c8VedV2nAHttKsqdWs0+zEUAnoj4ShnfT5jRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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