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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3033b3fd089e4bacf80ecd1591a69303ae7e836426e519ceecd3ed1553e544d' 
  AND token = 'eM81BnYP5nAeTuwXOzp6ZlEV08sRj6bfKlQBgmVSWkc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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